package gateway.filter;

import gateway.util.AppJwtUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthFilter implements Ordered, GlobalFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //判断是否登录，从header拿到token，如果没有token，认为没登录，token过期，未登录，其他放行
        //获取request和response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        String path = request.getURI().getPath();
        log.info("---------->{}",path);
        if(path.contains("login")){
            //放行
            return chain.filter(exchange);
        }

        //获取token，判断是否存在
        String token = request.getHeaders().getFirst("token");
        log.info("token:{}",token);
        if(StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //获取payload body信息，判断token是否有效
        int result = AppJwtUtil.verifyToken(AppJwtUtil.getClaimsBody(token));
        //-1：有效，0：有效，1：过期，2：过期
        if(result == 1 || result == 2){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}